Transmission-lock



H. S. CUHRIER.

TRANSMISSION LOCK.

APPLICATION FILED FEB. 28, I9I8.

1,328,724. I Patented Jan.20,1920;

2 SHEETS-SHEET 2- gwewboz I s@ MW movement to the extent required Vdetails shown,

" on'rr-nv nonnen s, como1inp or bernois, moments.

TnANsMssIoN-Locn.

noemen..

Application med February 2S,

To oli whom t may concern.' i

lie it lmovvn that LHowAnn S. Commun, e citizen ci" 'the United States, and residing et Dctroit, in the county of lJi/Teyne end Stute of Michigan, have invented n new an improved Trensrmssion-luock, of which the following is e specification. U

The present invention relates to vehicle locking means, its object being to e device that so cripples the vehicle es to prevent it from being driven or towed ewey by thieves und which nevertheless permits as u suieard against lire. y

@ne feature oi' the invention consists in means 'associe-ted with the transmission, say With the gearing, the control lever or bothbut preferably the letter-and opnintive when locked to prevent the our from being driven 'forwardly and yet permitting ,such movement rearwardly.

Again, the invei'ition consists in mechanism housed within :i transmission casing and adopted when in, one position to prevent nxoveznenrl of en element oi' said transmis sion, for exemple, e geur or e control lever, end also adopted to permit such movement reel y when in another position, und u lock carried by the casing end adopted to receive n controlling key, whereby the locking mechanism may be operated without dis-assembling the casing.

The invention also consists in inter-con neoted locking; elements, both housed in the transmission casing und one being operative on u control member wheres-s the other is adapted to prevent rotation of :i member which must function in order to permit ce1'- tein prescribed movements. together with e single lock exposed to receive n key where by the locking elements nre ectueted.

rl`he invention further consists in certain other arrangements of' ports and in certain described and claimed.

lin the drawings, Figure l'is e vertical section through u transmission provided with a preferred embodiment of the invention, the section being on broken line l-l .of Fig. 2. Fie'. 2 is e section on the line 2-2 of lig. l. Figs. 3 and fi are fragmentary sections on lines 3*-3 and lf-4, respectively, ot Fig.

The transmission shown'comprises the casing Il having the iront and rear We ls 2 and 3, the control lever housing 4, e mein d ive sheiht comprising e. trent or power applying seo Specification e! Letters latcnt.

provide -Ineshes with the teeth l?.

` whereby the low speed "'vention, they ere not shown,

may be mounted 1n 'a 15H9. Serial No. 279,699. f

tion 5 and e rear or power receiving section 6, the stationery countersh it 8 and the idler shaft 9. The shaft section 5 is driven from the Aengine shaft by Ineens of e suitable clutch ll and is provided'with Ineens such es the gear teeth 12 whereby the .stepped 'gear 13 on the eountershst u8 constantly driven therefrom. As shown, this gear is mede in one piece und has 'four sets of teeth 14r-15-l6-l7, but any of the usual .mechanical equivalents suoli. es e 'rotatable countershat having the seme or e different number ofsepera'te gears might he used. 'The idler shaft 9 carries a, gear 20 which The shaft section 5 also has clutch jaws 21 arranged to be engaged by jews 22 on e, geur 23 that is slid-- able on the central sphned portion o' the shaft section 6 und oi' proper pitch to mesh with the teeth 15 when in real-most' position, thus providing :tor either high or second speed4 forward, and for o neutral condition. Also splined on 'the shaft 6 is e second slida'ble gear :25 the teeth of which nre adopted to mesh with either the teeth 16 or 20 foi-Werd and. the reverse may be secured.

Any suitable Ineens may be employed for shifting the gears, that shown consisting ol the 'yokes 30--31 rigid Awith the longitudinally slidable shifter bars 32-33 having associnted notches Sli-35 in one or tlie'bther of Which the end of the control lever 36 (mounted for universal swinging movement) is received. The mechanism thus fer dcscribed is of Well known construction and has been shown and explained for the pun pose of indicating e desirable transmission to which the invention may be applied: it will be evident later that the invention is 4 applicable to transmission. vvhereinl the er' rangement of parts is Widely different.

In the present embodiment of the invention, l0 indicates e lock housing which is secured in the element i of the easing in any suitable wey, say by e nut 4l and dowel orpin 42. As the details of the lock may, be varied Widely and are not but it will' be xnderstood that by the use of a suitable hey 43 the stem 44 (the end portion of which lug 45) may be given throw the path of the angular movement to therebyhook 4G into or sway from the lever 36.

lt is evident that the cer would be locked Patented Jen. eo, 1.920.'

material to the m against being driven forwardly by the engine if the parts were so arranged as to lock the lever in neutral position, but this would not prevent it from being towed away by thieves, and l therefore prefer to so construct the parts that the lockingtakes place whenthe lever is in position to drive rearwardly, that is, when the gear is in mesh With the idler 20, as shown. In other words, this arrangement meets the underwriters requirements in so far as capability or removal 'from tire is concerned, and yet so cripples the car that any attempt to tow it away would quickly attract attention.

`Were no means provided to prevent it, the car could be towed forwardly, even when the hook 46 is in locking position, by disengaging the engine Ifrom the shaft 5; l, therefore, as a convenient means for accomplishing the purpose, provide the ,idler 20 with a ratchet wheel 50, rigidly connected thereto as by means of the pins 51, and prevent rotation (inthe direction these parts must turn when the car is towed forwardly) by means of the pawl 52 which is held out of engagement therewith when the hook 46 is out or the path of the lever 36. A goed example of means `for interconnecting the pawl 52 and the element 46 consists in the arm 53 (that may be integral with the pawl) the link 54, the bell crank 55, the link 5E (the latter slotted at 57) and the tension spring 58. When the hook 46 is swung tothe locking position, the spring 58 tends to hold the pawl and associated mechanism in the position indicated in Fig. 2, whereby the gear 20 is prevented from turning in the direc-r4 tion in which it must turn when the vehicle is towed. forwardly, but will permit movement in the oppor-:ite direction, the arm of the bell crank then working back and forth in the slot 57. On the othei` hand, when the lever 36 is 11n-locked the pawl assumes the position shown in dotted lines in Fig. 2, and the ,qear 20 is free to turn.

.The wall of the casing is preferably provided with lugs 60, 61 for rigidly supporting the shafts 62, 63 of theV bell-cranks 5253 and 55.

Obviously7 the details of the locking mechanism will vary considerably when applied to fliii'erent styles of transmissions, for example, elements other than the swinging hook 46 may serve to retain the control lever, but the device in any event need occupy but little space. l do not, therefore, wish to be limited except as indicated by the suhjoined claims.

l claim:

l. ln combination with a transmission having a casing, speed changingr mechanism and selecting means therefor housed in said casing, said speed changing mechanism including a rotatable element, and inter-connected members movable respectively intf the all path of a portion of the selecting;- means, and into the path of said rotatable clement, anda lock accessible from outside ot the casing whereby said inter-connected members may be secured in a desired position with reference to their operatively associated parts.

2. ln combination with a 'transmission having a casing'speed changing' mcchanisnr therein adapted to drivel a vchiclc forwardly or rearwardly at will, a selective device for said speed changingr mechanism, means housed in the casing for holding the selective device in the position of rearward driving, and a lock accessible. `from outside the casino for controlling said holding means.

3. ln combination with a driving shaft and a driven shaft alincd therewith. means 'for interconnectino` said shafts so that the latter turns in thc same direction as the former, means for intel'-connccting; said shafts so that the driven shaft turns oppositelyr to the driving shaft, means for selectively making said connections, and a device movable into the path ci a portion of said last named means for locking it in the position in which the driven shaft turns oppositely to the driving; shaft.

4.-. ln mechanism of the class described, a casing, a gear shiftingI lever projecting intr/i said casing and forming part oi a speed changing gear shitting device, a power transmitting element in said casinfJF which may be caused to rotate in either direction, means within the casing for preventing movement of said lever and for also pre- 'venting` rotation of said element, and a sin- ."gle lock accessible-troni outside the casing for controlling said means.

5. In combination with a transmission adapted for use in motor vehicles and including a-driving shaft and a driven shaft, means for inter-connecting said shafts so that the latter turns oppositely to the for mer, a ratchet wheel driven in one directibn when the shafts are so connected, a spring pressed pawl adapted to cooperate with said ratchet wheel to prevent movement in the opposite direction and arranged to snap down successively on the teeth of said wheel when the latter turns in the direction first stated, means for removing said pawl from the path of the Wheel and for locking it in thc last named position.

6. In combination with a transmission having a casing with an 'opening in its ripper side, a control lever housing` covering said opening, a member within `said casing rotatable when the vehicle is moved forwardly, and means for preventing the rotation of said member at will, said means includingir a lock carried by said housing, and a device positioned adjacent said member and engageablc therewith when the lock is in one position.

T. 'ln combination with a transmission inelliding a.4 casing having an opening in one side, a control lever housing mounted on the casing around said opening, e control lever carried by said housing,- `a lock also carried bg said housing, a rotatable member within and selecting means therefor honsed in saidv casing, said speed changing mechanism including a rotatable element, and inter-conu neeted members movabl respectively into the 'path of' rotatable element andof Asaid selecting means, a lock accessible from' outside of the casing whereby said' interconnected members may be secured in a def sired positionv with reference to tlieir operatively associated "parts, the means for connecting said interconnected members permitting rota-tion of said rotatable element in one direction while the lock'is in position to prevent such rotative movement in the op# posite direction. l

9. In n'ieehanisml or' the class described, a casing, a' gear shifting lever projecting into said 'casing andyforming part of a speed changinlgg gear shifting device, a rotatable power transmittingr element in said casing, means Within tll-ie casing for preventing movement of sa1d;le\'er and for also revent- .ing rotation of said element in one ireetion only, and a single` lock accessible from outside the casing for controlling said means.

HOWARD s. oURRiER.

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